Facial hair that is so sparse it can be considered as good as the fluff on one's bottom
That's not a moustache - that's bum fluff
by Gordon April 02, 2003
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light downy growth of adolescent facial hair; also written bum-fluff or bum fluff

used as an insult, mainly in britain
"Oh listen to me, you antipodean fleck of bumfluff!"

-- House talking with Chase in the Season 2 bloopers of "House M.D."
by House's 2nd Best Friend October 10, 2008
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Any random bits of hair that look like they shouldn't be there or just fluff.
"Look at that mostache its jus bumfluff!"
"You got bumfluff on ya jumpa."
by Emmax x x May 21, 2005
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Bum fluff is literally sparse and whispy facial hairs on an adolescent boy, (Or Asian girl)... Tee hee! Which resemble peach fuzz, under-bed lint, gossimar threads... or any fine downy substance.
"You look a right cunt with that bum fluff on thy face mate! Grow up and stop trying to look like a blonde girl's arse!!!!" * Mr Kipling's Diaries.*
by Spillage66 August 05, 2007
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Ah you're all wrong it aint on your arse it's on your face....god
hey you might wanna shave that bum fluff
by MaHe November 27, 2003
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Ass-lint, butthair.. The stuff that shite clings to and forms into dangling shite-berries.
Damn, bjootch! You got shite-berries in your bumfluff!!
by Fluffmeister-G October 26, 2003
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